GLOBAL SAFETY FIELD INVESTIGATIONS
DCS6721
URGENT - DISTRIBUTE IMMEDIATELY
Date:

November 15, 2023

Subject: N232428190 - Customer Satisfaction Program
Module Calibration Causing 12V Battery Drain
Models: 2024 Chevrolet Blazer EV
To:

All General Motors Dealers

General Motors is releasing Customer Satisfaction Program N232428190
today. The total number of U.S. vehicles involved is approximately 2,568.
Please see the attached bulletin for details.
Customer Letter Mailing
The customer letter mailing will begin on November 30, 2023.
Global Warranty Management (GWM)
The Required Field Action section on the Investigate Vehicle History (IVH) screen will
be updated November 15, 2023. A list of vehicles in dealer inventory is attached to this
message.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Customer Satisfaction Program
N232428190 Module Calibration Causing 12V Battery Drain
Release Date:
Attention:

November 2023

Revision:

00

This field action must only be completed by Chevrolet EV certified dealers who have met all Blazer EV
field action-specific training, tool and equipment requirements, and repairs must be performed by a
technician who has successfully completed the required training.
For Canadian Dealers: Only Chevrolet Dealers who have signed the Chevrolet Electric Models
Agreement and have met all the Chevrolet Blazer EV - specific training, tools, and equipment
requirements are eligible to complete the repair. Any Dealer unsure of their eligibility status should
immediately review with their District Service Manager.

Make
Chevrolet

Model
Blazer EV

Model Year
From
To
2024
2024

RPO

Description

Involved vehicles are marked “Open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition
Correction

Certain 2024 model year Chevrolet Blazer EV vehicles may have a condition in which the vehicle’s
modules drain the 12V battery.
Dealers are to reprogram the Battery Energy Control Module, Brake System Control Module, and Serial
Data Gateway Module.

Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9106897*
Important:

Description
Reprogram Battery Energy Control Module, Brake System Control
Module and Serial Data Gateway Module with SPS
Add: Fuse Removal and Reinstallation

Labor
Time

Trans.
Type

Net
Item

0.9
0.2

ZFAT

N/A

* To avoid warranty transaction rejections, carefully read and follow the instructions below:

6125814
• The Warranty Claim Code from the programming event must be accurately entered in the “Warranty Claim
Code” field of the transaction.
•

When more than one Warranty Claim Code is generated for a programming event, it is required to document all
Warranty Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the
“Warranty Claim Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter
the FINAL code provided by SPS2.

Copyright 2023 General Motors. All Rights Reserved.

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Customer Satisfaction Program
N232428190 Module Calibration Causing 12V Battery Drain
Warranty Claim Code Information Retrieval

6125774
If the Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS2 system as
follows:
1.
2.
3.
4.

Open TLC on the computer used to program the vehicle.
Select and start SPS2.
Select Settings (1).
Select the Warranty Claim Code tab (2).

The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. If the code is
retrievable, dealers should resubmit the transaction making sure to include the code in the SPS Warranty Claim Code
field.
Service Procedure
Caution: Before downloading the update files, be sure the computer is connected to the internet through a network cable
(hardwired). DO NOT DOWNLOAD or install the files wirelessly. If there is an interruption during programming,
programming failure or control module damage may occur.
Note: Carefully read and follow the instructions below.

•

Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector.
If there is an interruption during programming, programming failure or control module damage may occur.

•

Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will
interrupt programming. Install a GM Authorized Programming Support Tool to maintain system voltage. Refer to
www.gmdesolutions.com for further information. If not available, connect a fully charged 12 V jumper or booster
pack disconnected from the AC voltage supply. DO NOT connect a battery charger.

•

Follow the on-screen prompts regarding ignition power mode, but ensure that anything that drains excessive power
(exterior lights, HVAC blower motor, etc) is off.

•

Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.

Important: The service technician always needs to verify that the VIN displayed in the TLC left side drop down menu and
the top center window match the VIN plate of the vehicle to be programmed prior to using Service Programming System
2 (SPS2) for programming or reprogramming a module.

•

For the TLC application, service technicians need to always ensure that the power mode (ignition) is “ON” before
reading the VIN from the vehicle’s VIN master module and that they do not select a VIN that is already in the TLC
application memory from a previous vehicle.

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Customer Satisfaction Program
N232428190 Module Calibration Causing 12V Battery Drain
•

If the VIN that shows up in the TLC top center window after correctly reading the VIN from the vehicle does not match
the VIN plate of the vehicle, manually type in the VIN characters from the vehicle VIN plate into the TLC top center
window and use these for programming or reprogramming the subject module with the correct vehicle VIN and
software and/or calibrations.

•

The Engine Control Module (ECM) is the master module (for VIP vehicles) that TLC reads to determine the VIN of
the vehicle. If the VIN read from the vehicle by TLC does not match the VIN plate of the vehicle, the ECM also needs
to be reprogrammed with the correct VIN, software and calibrations that match the vehicle’s VIN plate.

•

The Body Control Module (BCM) is the master module (for GEM vehicles) that TLC reads to determine the VIN of
the vehicle. If the VIN read from the vehicle by TLC does not match the VIN plate of the vehicle, the BCM also needs
to be reprogrammed with the correct VIN, software and calibrations that match the vehicle’s VIN plate.

Caution: Be sure the VIN selected in the drop down menu (1) is the same as the vehicle connected (2) before beginning
programming.

5743643
Important: If the vehicle VIN DOES NOT match, the message below will be shown.

5877000

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Customer Satisfaction Program
N232428190 Module Calibration Causing 12V Battery Drain

5644477
Important: Techline Connect screens shown above.
Important: If the same calibration/software warning is noted on the TLC Summary screen, select OK and follow
screen instructions. After a successful programming event, the WCC is located in the Service Programming System
dialogue box of the SPS Summary screen. No further action is required. Refer to the Warranty section of the bulletin.
1.

Reprogram the following modules:
1.1. K16 Battery Energy Control Module. Refer to K16 Battery Energy Control Module: Programming and Setup in
SI.
1.2. K160 Brake System Control Module. Refer to K160 Brake System Control Module: Programming and Setup in
SI.
1.3 K56 Serial Data Gateway Module. Refer to K56 Serial Data Gateway Module: Programming and Setup in SI.

5644478
Note: The screenshot above is an example of module programming and may not be indicative of the specific module
that is being programmed. Module selection and VIN information have been blacked out.
Important: To avoid warranty transaction rejections, you MUST record the warranty claim code provided on the
Warranty Claim Code (WCC) screen shown above on the job card. Refer to callout 1 above for the location of the
WCC on the screen.
Important: Use the last warranty claim code for warranty transaction submission.
2.

Record SPS Warranty Claim Code on job card for warranty transaction submission.

3.

Verify vehicle has no radio concerns (black display, missing icons, etc.)
• If concerns ARE NOT found, no further action is required.
• If concerns ARE found, proceed to step 4.

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Customer Satisfaction Program
N232428190 Module Calibration Causing 12V Battery Drain

6280263
Note: Left side shown, right side similar.
4.

Using a flat-bladed plastic trim tool, release the retaining clips (x2).

5.

Pull rearward to clear the tab and remove the Passenger Side Instrument Panel Outer Trim Cover (1).

6280255
6.

Using a flat-bladed trim tool, release the retaining clips.

7.

Remove the Instrument Panel Fuse Block Access Hole Cover (1).

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Customer Satisfaction Program
N232428190 Module Calibration Causing 12V Battery Drain

6473711

8.

Remove the F26DA (1) radio fuse from the X51A Instrument Panel Junction Block/IP fuse block.

9.

Wait five minutes and reinstall the fuse.

10. Confirm radio display functions have been resolved.

6280255
11. Install the Instrument Panel Fuse Block Access Hole Cover (1).

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Customer Satisfaction Program
N232428190 Module Calibration Causing 12V Battery Drain

6280263
Note: Left side shown, right side similar.
12. Install the Passenger Side Instrument Panel Outer Trim Cover (1).
Dealer Responsibility
All new, used, GM Certified Pre-Owned (CPO), courtesy transportation vehicles, dealer shuttle vehicles, CarBravo, etc.
in dealers' possession and subject to this field action must be held and inspected/repaired per the service procedure of
this bulletin before customers take possession of these vehicles. Involved vehicles must be held and not delivered to
customers, dealer-traded, released to auction, used for demonstration, or any other purpose.
All GM Certified Pre-Owned (CPO) vehicles currently in the dealers’ inventory within the SHIFT Digital system will be
de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting an accepted/paid
warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified for sale within
the SHIFT Digital system, or once again be used in the Courtesy Transportation Program.
Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle,
or ownership, from this time forward.
Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer
information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the
required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this
bulletin for your use in contacting customers. Program follow-up cards should not be used for this purpose, since the
customer may not as yet have received the notification letter.
In summary, whenever a vehicle subject to this field action enters your vehicle inventory you must take the steps
necessary to ensure the program correction has been made before selling the vehicle. In addition, for vehicles entering
your facility for service, you are required to ensure the customer is aware of the open field action and make every
reasonable effort to implement the program correction as set forth in this bulletin prior to releasing the vehicle.
Dealer Reports – For USA & Export
For dealers with involved vehicles, a listing has been prepared and will be available through GM GlobalConnect Maxis
Field Action Reports or sent directly to export dealers. The Inventory tab of the dealer reports will contain VINs that
apply to this field action. This information is intended to assist dealers with the PROMPT COMPLETION of these
vehicles. The Customer In-Service tab will contain customer names and addresses from Motor Vehicle Registration
Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete
this field action may be a violation of law in several states.
Courtesy Transportation – For USA & Canada
Courtesy transportation is available for customers whose vehicles are involved in a product program and still within the
warranty coverage period. See General Motors Service Policies and Procedures Manual for courtesy transportation
program details.

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Customer Satisfaction Program
N232428190 Module Calibration Causing 12V Battery Drain
Customer Notification
USA & Canada - General Motors will notify customers of this program on their vehicle (see copy of customer letter included
with this bulletin).

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained
technicians have the tools, equipment, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT
assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your dealer for information on whether your
vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

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Customer Satisfaction Program
N232428190 Module Calibration Causing 12V Battery Drain
November 2023
This notice applies to your vehicle, VIN: ________________________________
Dear General Motors Customer:
We have learned that your 2024 model year Chevrolet Blazer EV may have a condition in which the vehicle’s modules
drain the 12V battery.
Your satisfaction with your Blazer EV is very important to us, so we are announcing a program to prevent this condition
or, if it has occurred, to fix it.
What We Will Do: Your GM dealer will reprogram the Battery Energy Control Module, Brake System Control Module,
and Serial Data Gateway Module. This service will be performed for you at no charge.
What You Should Do: To limit any possible inconvenience, we recommend that you contact your dealer as soon as
possible to schedule an appointment for this repair. When scheduling your appointment, confirm with the dealer that
they are an EV certified dealer.
If you have any questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer
Assistance Center at the number listed below.
For the hearing or speech impaired, please contact our Customer Assistance Center using the Telecommunication
Relay Service by dialing 711 then providing the appropriate Customer Assistance Center number for your vehicle.
Division
Chevrolet Blazer EV
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

Number
1-833-EVCHEVY
(1-833-382-4389)
1-866-467-9700
1-866-467-9700
1-866-467-9700

Text Telephones (TTY)
711 / 1-800-833-2438

We truly appreciate you taking the time to update your vehicle as we know your time is valuable. We want you to know
that we will do our best, throughout your ownership experience, to ensure that your Chevrolet Blazer EV vehicle
provides you many miles of enjoyable driving.
Neelie O’Connor
Global Executive Director
Customer Experience Operations
N232428190

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